What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France)
International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visibl...
Published in: | Earth Surface Processes and Landforms |
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Language: | English |
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Online Access: | https://doi.org/10.1002/esp.3992 https://hal.archives-ouvertes.fr/hal-02440776 |
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fttriple:oai:gotriple.eu:10670/1.wlpkp8 2023-05-15T16:36:39+02:00 What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut de gestion des entreprises -USJ (IGE) Université Saint-Joseph de Beyrouth (USJ) Institut des Géosciences de l’Environnement (IGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Ecole nationale de ski et d'alpinisme Queenstown, New Zealand 2019-12-04 https://doi.org/10.1002/esp.3992 https://hal.archives-ouvertes.fr/hal-02440776 en eng HAL CCSD hal-02440776 doi:10.1002/esp.3992 10670/1.wlpkp8 https://hal.archives-ouvertes.fr/hal-02440776 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société First Southern Hemisphere Conference on Permafrost - SouthCOP2019 First Southern Hemisphere Conference on Permafrost - SouthCOP2019, Dec 2019, Queenstown, New Zealand. 42, pp.426 - 438, 2016, ⟨10.1002/esp.3992⟩ geo envir Conference Output https://vocabularies.coar-repositories.org/resource_types/c_c94f/ 2019 fttriple https://doi.org/10.1002/esp.3992 2023-01-22T18:24:20Z International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visible only when a rockfall occurs, exposing previously hidden ice. Over the past two years, the two largest rockfalls of the decade in the Mont Blanc massif and a smaller one allowed to start the documentation of the rockwall permafrost ice. This poster aims to present the three cases. Up to now, dating has been carried out for only one of the three cases. How to date permafrost ice? Dating ice cores from alpine glaciers has shown the wide time span covered by these, from a few decades to several thousand years. Several dating methods are available to quantify the age. Counting the annual layers, which proved to be effective, is widely used in the study of mountain glaciers but cannot be used for the internal ice of the permafrost since it does not present these annual layers. Structure of the ice in the scar of the Trident of Tacul rockfall scar shows nevertheless a series of layers. We will therefore use radionuclide dating to obtain the absolute age of the ice. So far, only one age is available for interstitial ice from permafrost-affected rockwall: the ice sampled from a felt block that is part of the deposit of the 150'000 m 3 rockfall that occurred in Feb. 2014 at Piz Kesch (Swiss Alps; Other/Unknown Material Ice permafrost Unknown Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) New Zealand The Trident ENVELOPE(-37.083,-37.083,-54.167,-54.167) Trident ENVELOPE(169.233,169.233,-72.433,-72.433) Earth Surface Processes and Landforms 42 3 426 438 |
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Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
topic_facet |
geo envir |
description |
International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visible only when a rockfall occurs, exposing previously hidden ice. Over the past two years, the two largest rockfalls of the decade in the Mont Blanc massif and a smaller one allowed to start the documentation of the rockwall permafrost ice. This poster aims to present the three cases. Up to now, dating has been carried out for only one of the three cases. How to date permafrost ice? Dating ice cores from alpine glaciers has shown the wide time span covered by these, from a few decades to several thousand years. Several dating methods are available to quantify the age. Counting the annual layers, which proved to be effective, is widely used in the study of mountain glaciers but cannot be used for the internal ice of the permafrost since it does not present these annual layers. Structure of the ice in the scar of the Trident of Tacul rockfall scar shows nevertheless a series of layers. We will therefore use radionuclide dating to obtain the absolute age of the ice. So far, only one age is available for interstitial ice from permafrost-affected rockwall: the ice sampled from a felt block that is part of the deposit of the 150'000 m 3 rockfall that occurred in Feb. 2014 at Piz Kesch (Swiss Alps; |
author2 |
Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut de gestion des entreprises -USJ (IGE) Université Saint-Joseph de Beyrouth (USJ) Institut des Géosciences de l’Environnement (IGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Ecole nationale de ski et d'alpinisme |
format |
Other/Unknown Material |
author |
Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François |
author_facet |
Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François |
author_sort |
Magnin, Florence |
title |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_short |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_full |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_fullStr |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_full_unstemmed |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_sort |
what can we learn from ice collected in high mountain rockfall scars? three examples from the mont blanc massif (france) |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://doi.org/10.1002/esp.3992 https://hal.archives-ouvertes.fr/hal-02440776 |
op_coverage |
Queenstown, New Zealand |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(-37.083,-37.083,-54.167,-54.167) ENVELOPE(169.233,169.233,-72.433,-72.433) |
geographic |
Mont Blanc New Zealand The Trident Trident |
geographic_facet |
Mont Blanc New Zealand The Trident Trident |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société First Southern Hemisphere Conference on Permafrost - SouthCOP2019 First Southern Hemisphere Conference on Permafrost - SouthCOP2019, Dec 2019, Queenstown, New Zealand. 42, pp.426 - 438, 2016, ⟨10.1002/esp.3992⟩ |
op_relation |
hal-02440776 doi:10.1002/esp.3992 10670/1.wlpkp8 https://hal.archives-ouvertes.fr/hal-02440776 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1002/esp.3992 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
42 |
container_issue |
3 |
container_start_page |
426 |
op_container_end_page |
438 |
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1766026984015527936 |